find the unit digit of 27^2015 + 21^2015 - 23^2015
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For the concept of identifying the unit digit, we have to first familiarize with the concept of cyclicity. Cyclicity of any number is about the last digit and how they appear in a certain defined manner. Let’s take an example to clear this thing:
The cyclicity chart of 2 is:
21 =2
22 =4
23 =8
24=16
25=32
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